DOPACDopamine Metabolite: Combined measurements of DOPAC and dopamine have been used to assess the activity of dopaminergic neurons.

Dopamine Excitatoryneuromodulator: Dopamine is the precursor to norepinephrine and epinephrine, which are all catecholamines. Dopamine plays a large role in the pleasure/reward pathway (addiction and thrills), memory, and motor control.

Epinephrine Excitatory neuromodulator: Epinephrine also known as adrenaline is derived from the amine norepinephrine. As a neurotransmitter, epinephrine regulates attentiveness and mental focus.